heres a trick i use when i use my casting reels on a boat or surf.
all of them are open frames with no levelwinds so the idea is the same. we call it simply 'thumbing the line'
except in this case, youll need to use your right index finger.
from your pic, your reeling with the left hand?
when you have a fish on, (rod in right hand) slightly roll your rod up 45deg clockwise. (point the reel towards your left thigh)
when the line hits the right flange of the spool,
use your index finger to push the line from the right side to the left side of the spool while reeling in.
relax the finger when the line is on the left flange,
if you keep reeling, gravity and physics makes the line return to the left side automatically (because your reel is slightly turned to the side)
then you push it to the left again.
itll take practice to get used to this. after a while itll become second nature. and youll never have this kind of problem again.